Here's the list of center fielders who have slugged .600 in a season (working backwards from most recent):
Ken Griffey Jr.
Hank Aaron (played more than half his games in center field in 1962)
Those 15 players slugged .600 a combined 35 times (as center fielders only). Mays did it six times. Of those 35 seasons, the three highest OPS+ figures all belong to Mantle (1957, 1956, 1961). Trout's current OPS+ would tie him with Mantle's 1955 season for 10th on the list. (All data from Baseball-Reference.com.)
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